<s>
Solipsis	B-Protocol
is	O
a	O
free	B-Application
and	O
open-source	B-Application
system	O
for	O
a	O
massively	O
multi-participant	O
shared	O
virtual	B-Application
world	I-Application
designed	O
by	O
Joaquin	O
Keller	O
and	O
Gwendal	O
Simon	O
at	O
France	O
Télécom	O
Research	O
and	O
Development	O
Labs	O
.	O
</s>
<s>
Relying	O
on	O
a	O
peer-to-peer	O
architecture	O
,	O
the	O
virtual	B-Application
world	I-Application
may	O
potentially	O
be	O
inhabited	O
by	O
a	O
theoretically	O
unlimited	O
number	O
of	O
participants	O
.	O
</s>
<s>
A	O
central	O
objective	O
of	O
Solipsis	B-Protocol
is	O
to	O
create	O
a	O
virtual	B-Application
world	I-Application
which	O
is	O
as	O
independent	O
as	O
possible	O
from	O
the	O
influence	O
of	O
private	O
interests	O
,	O
such	O
as	O
server	O
ownership	O
.	O
</s>
<s>
Additionally	O
,	O
it	O
aims	O
to	O
give	O
users	O
more	O
flexibility	O
in	O
designing	O
interfaces	O
and	O
content	O
in	O
their	O
individual	O
segments	O
of	O
the	O
virtual	B-Application
world	I-Application
.	O
</s>
<s>
A	O
Solipsis	B-Protocol
entity	O
is	O
a	O
basic	O
element	O
of	O
the	O
virtual	B-Application
world	I-Application
.	O
</s>
<s>
A	O
navigator	O
is	O
mainly	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
,	O
but	O
some	O
communication	O
services	O
may	O
be	O
added	O
to	O
one	O
for	O
interaction	O
between	O
entities	O
.	O
</s>
<s>
The	O
virtual	B-Application
world	I-Application
is	O
initially	O
empty	O
and	O
is	O
only	O
filled	O
by	O
entities	O
run	O
by	O
end	O
users	O
 '	O
computers	O
.	O
</s>
<s>
All	O
Solipsis	B-Protocol
nodes	O
are	O
functionally	O
equal	O
,	O
and	O
no	O
preordained	O
infrastructure	O
is	O
required	O
.	O
</s>
<s>
Solipsis	B-Protocol
currently	O
consists	O
of	O
:	O
</s>
<s>
A	O
peer-to-peer	O
protocol	O
over	O
UDP	B-Protocol
.	O
</s>
<s>
The	O
Solipsis	B-Protocol
protocol	O
gives	O
a	O
node	O
the	O
ability	O
to	O
broadcast	O
its	O
presence	O
within	O
the	O
virtual	B-Application
world	I-Application
.	O
</s>
<s>
A	O
node-navigator	O
interface	O
,	O
which	O
takes	O
the	O
form	O
of	O
an	O
API	B-Application
between	O
the	O
node	O
and	O
the	O
navigator	O
.	O
</s>
<s>
Currently	O
written	O
in	O
XML-RPC	B-Protocol
,	O
this	O
interface	O
allows	O
a	O
navigator	O
to	O
control	O
a	O
node	O
and	O
to	O
retrieve	O
information	O
on	O
its	O
virtual	O
surroundings	O
.	O
</s>
<s>
A	O
basic	O
implementation	O
of	O
a	O
Solipsis	B-Protocol
Node	O
and	O
a	O
Solipsis	B-Protocol
navigator	O
licensed	O
under	O
the	O
LGPL	B-Application
.	O
</s>
<s>
The	O
navigator	O
features	O
a	O
two-dimensional	O
representation	O
of	O
the	O
virtual	B-Application
world	I-Application
.	O
</s>
<s>
Interaction	O
between	O
entities	O
consists	O
only	O
of	O
chat	B-Protocol
.	O
</s>
<s>
Some	O
other	O
services	O
,	O
which	O
implement	O
blogs	O
,	O
some	O
identity	O
fields	O
for	O
social	O
networking	O
,	O
file	O
sharing	O
,	O
and	O
graphical	O
chat	B-Protocol
.	O
</s>
